2026 is a revaluation year for all properties in the City of Sun Prairie, and the Assessor's Office will be changing all assessments to reflect market value on all properties as of January 1. Market value is determined using the arms-length sales that have occurred in Sun Prairie.
The Assessor's Office will be reviewing descriptions on all properties. Staff will not be doing interior inspections on all properties. Instead, staff will verify and validate the current interior descriptions of properties. Staff will use digital imaging, when possible, for the exterior reviews. Some exterior reviews in the field may be necessary.
We anticipate the 2026 values to be sent out in late July. Please note that increasing the assessed values does not mean everyone will have higher taxes.
Authority
Assessors and authorized staff are permitted by Wisconsin State Statutes 943.13 and 943.15 to enter private property to perform assessments, however they may only do so once per year unless the owner consents (See Section 70.05(4m), Wisconsin Statutes).
Property owners may refuse entry to their property by giving notice to the Assessor's Office at the time of the request. However, if a property owner denies a written request delivered by certified mail to view the property, they shall not be allowed to contest the amount of the assessment before the Board of Review (See Section 70.47(7)(aa), Wisconsin Statutes).
Questions
Residents with questions about the 2026 revaluation process or assessment procedures should contact the City of Sun Prairie Assessor's Office.
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City of Sun Prairie
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